21333003021 has 32 divisors (see below), whose sum is σ = 35042816640. Its totient is φ = 12717129600.

The previous prime is 21333002969. The next prime is 21333003031. The reversal of 21333003021 is 12030033312.

It is not a de Polignac number, because 21333003021 - 2¹⁰ = 21333001997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21333002985 and 21333003003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333003031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 570640 + ... + 606873.

It is an arithmetic number, because the mean of its divisors is an integer number (1095088020).

Almost surely, 2^21333003021 is an apocalyptic number.

It is an amenable number.

21333003021 is a deficient number, since it is larger than the sum of its proper divisors (13709813619).

21333003021 is a wasteful number, since it uses less digits than its factorization.

21333003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177594 (or 1177588 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21333003021 its reverse (12030033312), we get a palindrome (33363036333).

The spelling of 21333003021 in words is "twenty-one billion, three hundred thirty-three million, three thousand, twenty-one".